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450 AIR INTERFACE SIGNALING IN CDMA NETWORKSTABLE 13.4-4 RRC MessagesMessage Logical Channel DirectionInter RAT Handover Information N/A MS ! BSMeasurement Report DCCH MS ! BSPaging Type 1 PCCH BS ! MSPaging Type 2 DCCH BS ! MSRadio Bearer Release DCCH BS ! MSRadio Bearer Release Complete DCCH MS ! BSRadio Bearer Setup DCCH BS ! MSRadio Bearer Setup Complete DCCH MS ! BSRRC Connection Release CCCH DCCH BS ! MSRRC Connection Release Complete DCCH MS ! BSRRC Connection Request CCCH MS ! BSSignalling Connection Release DCCH BS ! MSSignalling Connection Release Indication DCCH MS ! BSUplink Direct Transfer DCCH MS ! BSNote: RAT, radio access technology; MS, mobile station; BS, base station.RRC signaling messages are listed in Table 13.4-4. UTRAN standards specifymessage formats in the ASN.1 notation (Section 16.2) [46], which makes it impracticalto show their bit maps in concise form. The reader interested in the detailedformats is referred to [45].As an example of message contents, Table 13.4-5 shows the most significantinformation elements in the uplink Direct Transfer message. The CN Domain IdentityIE has two values: Circuit-Switched Domain and Packet-Switched Domain. TheNAS message IE contains the message to/from the core network (the Non-AccessStratum).13.4.7 UTRAN Call SequencesCall sequences are similar to the ones described for IS-95 in Section 13.2.5, with theexception of the initialization procedure, which is markedly different and isdescribed belowAn example of a message sequence for the setup and release of a RRC connectionis shown in Fig. 13.4-8.TABLE 13.4-5 Information Elements in the Uplink DirectTransfer MessageIECN domain identityMessage authentication codeMessage typeNAS messageRRC message sequence numberRRC transaction identifier